JP5238927B2 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- JP5238927B2 JP5238927B2 JP2007065353A JP2007065353A JP5238927B2 JP 5238927 B2 JP5238927 B2 JP 5238927B2 JP 2007065353 A JP2007065353 A JP 2007065353A JP 2007065353 A JP2007065353 A JP 2007065353A JP 5238927 B2 JP5238927 B2 JP 5238927B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 37
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- 239000002184 metal Substances 0.000 claims description 2
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- 229910052802 copper Inorganic materials 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
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- 239000002274 desiccant Substances 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
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- 238000004544 sputter deposition Methods 0.000 description 1
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- 239000011345 viscous material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- H01L23/495—Lead-frames or other flat leads
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Description
まず、図12に示すように、主表面に素子領域101が形成されたウエハ102aを用意し、ウエハ102aの表面に保護テープ105aを貼り付ける。
まず、図16に示すように、表面側に素子領域201が形成されたウエハ202aを用意し、ウエハ202aの裏面をダイシング台203にバキューム等で吸着して固定する。そして、ウエハ202aの表面をハーフダイシングして溝部204を形成する。
まず、図1に示すように、表面側に素子領域1が形成されたウエハ2aを用意し、素子領域1を囲むように溝部4を形成する。このとき、溝部4は、少なくとも完成後のチップの膜さよりも深くなるように形成される。
本発明は、ウエハに溝部4を形成する方法として、下記のとおり、様々な方法が適用される。
前記実施形態では、各チップ2bを支持体5に貼り付けた状態で裏面電極9aを形成していた(図4)。このとき、溝部4に接着層6が完全に埋め込まれていると、電極材料8が、チップ9aと溝部4に露出した接着層6上とで途切れずに形成されてしまい、接着層6を溶解しようとしても(図5)、チップ2bが電極材料8によってつながったままで溶解できない。このため、接着層6を完成後のチップ2bの厚さよりも低くなるように形成する必要がある。
前記実施形態では、ウエハ2aを研削すると同時に、各チップ2bに個片化していた。この後、各チップ2bは、支持体5に貼り付けたままで次の工程に搬送されるが、このとき、チップ2bは裏面の端部がチッピングしやすい。これを防ぐべく、チップ2bの端部に丸みを形成する工程が追加されてもよい。具体的には、ウエハ2aを研削した後、例えば、酸(例えば、HFと硝酸等との混合液)をエッチャントとしてウエハ2aの裏面をわずかにエッチングすればよい。
前記実施形態では、接着層5を溶解すると、各チップ2bは支持体5から分離したが(図5)、これは、電極材料8がチップ2b上と接着層上とで不連続に形成されているからである。以下、電極材料8の不連続性について詳細に説明する。
接着層5を溶解するには、接着層5に溶解剤17を混入する必要があり、その具体例について以下説明する。
前記実施形態では、裏面電極9bは、チップ2bの裏面上のみならず、側壁に延在して形成される。これにより、裏面電極9bとアイランド12aとを、半田等の導電材13aを介して接続してリフロー処理を施すと、導電材13aはチップ2bの外部に向かって流動する。したがって、導電材13aは、サイドフィレット13bを形成し、チップ2bとアイランド12aとが強固に接続される。
一般に、半導体装置の製造では、全工程が同じ場所で行われるのではなく、例えば前工程が日本でなされ、後工程がアジアで行われる。特に、ウエハ2aを加工する工程とチップ2bを実装する工程とは、別の場所で行われることが多い。
2a ウエハ
2b チップ
3 ダイシング台
4 溝部
4a 側壁部
4b 側壁部
5 支持体
6 接着層
7 BGテープ
8 電極材料
9a 裏面電極
9a 電極側壁部
10a 側壁部
10b 側壁部
11 溶解孔
12a アイランド
12b リード
13a 導電材
13b サイドフィレット
14 ワイヤ
15 搬送ケース
17 溶解剤
18 吸引機
19 ドライ剤
101 素子領域
102a ウエハ
102b チップ
103 ダイシング台
105a 保護テープ
105b 固定テープ
105c フラットリング
107 研削固定台
112a アイランド
112b リード
113 導電ペースト
114 ワイヤ
201 素子領域
202a ウエハ
202b チップ
203 ダイシング台
204 溝部
205a 保護テープ
205b フラットリング
207 研削固定台
Claims (11)
- 表面に素子領域が形成されたウエハを用意し、
前記素子領域を囲むように溝部を形成する工程と、
前記ウエハの表面に接着層を介して剛性のある支持体を貼り付ける工程と、
前記ウエハを裏面から前記溝部に到達するまで薄膜化してチップに分離する工程と、
前記チップを支持体に貼り付けた状態で前記チップの裏面に裏面電極を形成する工程と、
前記接着層を溶解し前記チップをそれぞれ分離する工程と、を含み、
前記溝部を形成する工程は、前記溝部の上端部の幅が狭くなるように前記溝部の内壁が湾曲するように形成するか、又は前記溝部の内壁が波状に荒れるように形成する工程であり、前記接着層は、前記溝部に入り込み、前記チップの膜厚より浅くなるように塗布されることを特徴とする半導体装置の製造方法。 - 前記支持体は、ガラス,石英,セラミック,プラスチック,金属,樹脂のいずれかからなることを特徴とする請求項1に記載の半導体装置の製造方法。
- 前記チップは、80μmよりも薄く形成されることを特徴とする請求項1又は2に記載の半導体装置の製造方法。
- 前記薄膜化の後に、前記チップの上端に丸みを形成することを特徴とする請求項1〜3のいずれかに記載の半導体装置の製造方法。
- 前記裏面電極は、前記溝部に入り込んだ接着層の量に応じて前記チップの側壁の途中までに広がって形成されることを特徴とする請求項1〜4のいずれかに記載の半導体装置の製造方法。
- 前記チップを実装する工程を含み、
前記裏面電極は、ロウ材により固着され、
前記ロウ材は、前記途中に応じてサイドフィレットを形成していることを特徴とする請求項5に記載の半導体装置の製造方法。 - 前記ウエハと前記支持体とは、前記支持体に前記接着層が塗布されてから貼り合わされることを特徴とする請求項1〜6のいずれかに記載の半導体装置の製造方法。
- 前記ウエハと前記支持体とは、前記ウエハに前記接着層が塗布されてから貼り合わされ、
前記溝部には、濡れ性に妨げられずに前記接着層が入り込むことを特徴とする請求項1〜6のいずれかに記載の半導体装置の製造方法。 - 前記支持体には溶解孔が設けられており、前記接着層は前記溶解孔から溶解剤が注入されて除去されることを特徴とする請求項1〜8のいずれかに記載の半導体装置の製造方法。
- 前記裏面電極が形成されたチップの裏面に、溶解孔が形成された固定テープを貼り付け、
前記溶解孔から溶解剤を供給することにより前記接着層を溶解することを特徴とする請求項1〜8のいずれかに記載の半導体装置の製造方法。 - 前記チップを吸引装置で固定した後に、前記溝部から溶解剤を吸引して、前記接着層を溶解することを特徴とする請求項1〜8のいずれかに記載の半導体装置の製造方法。
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